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### Author Topic: please hellp me  (Read 3260 times)

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#### komar1970

• 111
##### please hellp me
« on: April 23, 2011, 06:30:22 PM »
Please give me some advices how to set the motor steps in MACH3
I mean if i open mach3 i go to setting and set steeps per unit
You can choose at this point, Y, Z, X, or A axis
I do not know how far to move up axis
I work in mm
and I use for that Digital Indicator
For example, when you write a 5mm machine is travels 4.987mm
a few times Digital Indicator shows the machine is moved 5mm
it should be a good setting steps per unit
For example, ball screw is pinch 4mm the driver is 10 micro steps
the motors motors 200 steps

So we'll take the motors 200 steps multiply that by the drives 10 micro step.
(200 X 10 = 2000)
The drive needs 2000 pulses (or steps) to turn the screw one revolution thus
making the axis
move 4mm. So now we take those 2000 steps and divide by the pitch of the screw,
which is 4.
(2000 / 4 = 500). In other words we need 500 steps to move one unit or mm.

but the setting in Mach3 shows me 513 steps This maybe the problem is backlash
problem because it shows 513 steps .but the worst thing is if you set the
Steppes motor to travels 5mm and the machine is moving 5mm everything is OK

but how do you tell the machine to go 200mm, machine is travels
197.499mm can you tell my Worth problem it is
thanks mark

#### TramAlot

• 129
##### Re: please hellp me
« Reply #1 on: April 23, 2011, 09:37:41 PM »
As I remember after you set each axis you need to save it, lower right I believe . Tic the box?

#### komar1970

• 111
##### Re: please hellp me
« Reply #2 on: April 24, 2011, 08:36:34 AM »
I am doing this

#### RICH

• 7,419
##### Re: please hellp me
« Reply #3 on: April 24, 2011, 09:46:34 AM »
There are four  basic settings for each motor you are going to tune.
The manual gives definition for each.
You can calculate the steps per unit, use the calculator posted in the TOOL BOX, or use the axis calibration feature of MACH ( very easy to use ) .
The velocity and accelertion are motor specific such that it deppends on the users system and there have been numerous post on how to adjust them.
Step Pulse setting is determined by your drive requirements and usualy the maker gives a recomendation.

After the initial settings the user should check backlash ( either get rid of it or use backlash compensation ) and refine the velocity and acceleration.

RICH

#### komar1970

• 111
##### Re: please hellp me
« Reply #4 on: April 24, 2011, 10:53:49 AM »
my system  it is  gecko driver g540
ballscrew  from nsk pinch 4mm
step  motors
Y,X
http://joeleldredge.com/magento/cnc-products/drives-motors/stepper-drive-motors/nema-34-600-ozin-stepper-motor.html
and
Zaxis
http://joeleldredge.com/magento/cnc-products/drives-motors/stepper-drive-motors/nema-34-960-ozin-stepper-motor.html

i dont  now hat  to setup the velocity and accelertion
please  hell me

#### RICH

• 7,419
##### Re: please hellp me
« Reply #5 on: April 24, 2011, 05:30:38 PM »
So start with a velocity of  10 and accel of 1, increase to 20 / accel 2, etc and see where they start to skip and backoff velocity by 30% of the max.
RICH

#### komar1970

• 111
##### Re: please hellp me
« Reply #6 on: April 25, 2011, 03:57:01 PM »
thanks will change